Telephone system.



H. P. CLAUSEN.

TELEPHONE SYSTEM.

APPLlCATlON FILED APR. 26. 1911.

1 262352., Patented Ap1n16, 191s.

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HENRY 1. CLAUSEN, 0F MOUNT VERNON, NEW YORK, ASSIGNOR T0 WESTERN ELECTRIC 001mm INCORPORATED, OF NEW YORK, N. Y., A CORPORATION 015 NEW YORK.

TELEPHONE SYSTEM. I

. Specification of Letters Patent. Patented App, 16 1918,

. Application filed April 26, 1917. Serial No. 16%,651.

To all whom it may concern:

Be it known that I, HENRY P. CLAUSEN, a citizen of the United States, residing at Mount Vernon, in the county of Westchester and State of New York, have invented cer-.

tain new and useful Improvements in Telephone Systems, of which the following is 'a full, clear, concise, and exact description.

This invention relates to telephone systems, and has for its object the provision of tween subscribers, by the use of relays which are only energized while the connection is being established.

The circuit arrangements are somewhat similar to those described. in the patentv to 'Glement, 939,186. Here, as, there, two re- A feature of the present invention, 1118111,; is the'use of one less tens relay than the number of groups of lines. According to this feature the telephone numbers whose digit should be zero may be employed in the ordinary manner in which numbers are expressed. In other words, those telephones which belong in the zero group may be called through the actuation of'a units relay only, the actuation of a tens relay being unnecessary.

According to the-first-mentioned feature a relay when energized has its armature mechanically locked in the actuated position. The locked armature may then be released through special releasing means, or it may be left in the actuated IJOSlLlOIl until a new call is made. In the latter case another relay, upon being energized, will release the first. looked armature and have its armature locked after the manner in which keys are locked, as described in the patent to Ham, No. 634,57

Through such an arrangement no current is allowed to flow through the connecting "relays during conversation and the drain upon the batteries is extremely light, no expensive power plant is necessary, it being possible to utilize inexpensive dry batteries for the operation of this system.

It is thought that the invention will best be understood from the following detailed description, reference being had to the accompanying drawing, in which the portion to the left ofthe left-hand broken line represents the apparatus and connections at a substation, the portion between the two broken lines represents the apparatus and connections at a connectingbox; and the portion to the right of the right-hand broken line represents the main cable with an indicated called substation connected to one of the lines.

For the sake of simplicity, the system has been shown as a single conduct-01" system with acommon return, the common return bemg indicated asa ground connection, although it should be understood that a single conductor may be used instead of a ground connection. I

It should further be understood that this arrangement is not limited to a single conductor system slnce it might. as well be a two conductor metallic circuit system without changing the spirit of the invention.

The calling substation S is provided with a transmitter T, a receiver R, an induction coil 1, a condenser C, a switchhook H, and a call bell B. There are provided a number of buttons T", T and T, which control the tens relays. There are also provided ten buttons U to U inclusive, which control the units relays. In addition, there isa button S", which controls, as shown, the

firsttens relay and'the eighth units relay.

The button A is known as the answering button, and is provided to restore the vappa- 'ra-tus to normal condition, in which .a call to this station may be answered. A button K, connected within the substation circuits, itself is used for ringing a called line after the connection has been set up by the pressure of the proper tens and units buttons.

The connecting box contains a number of tens relays, three bein shown, Nos. 1, 2 and 3. In addition there are ten units relays, Nos. 10 to 19 inclusive. the tens relays are controlled through a locking plate P in a manner similar to that descjiibed in connection with the key in the The armatures of iio upon being energized, will release the first locked relay and itself become locked. The same arrangement is provided for the ten units relays, theplate P controlling these relays in a similar manner.

The main cable consists of what might be called the multiple of this system, that is, a

.wire." When the receiver a small amount of current sidered negligible.

single conductor for each one of the substations with the necessary conductors for supplying battery current, etc. It is intended that this main cable shall be run through a building where such a system is installed to a convenient point where the connecting box may be located, and from which connecting boX a cable carrying a much smaller number of conductors be run to the substation itself.

The battery supply may be as indicated in the portion designated the main cable, and cons1sts of a battery of low potential connected in series with a battery of a higher potential, with conductors leading from eitherend through the main cable to the con necting box. The battery of higher potential is extended to the connecting relays and forms the source of current through which these relays are operated. It also is eat-ended to the lower contact of the button K, and is thereby used as a source of current through which the substations may be rung.

The battery of low potential is extended through the main cable to the connecting.

box, where it is led through an impedance coil 9 to the left-hand armature and contact of relay 10, left-hand armature and contact of relay 11, and so on to the left-hand armature and contact of relay 19, thence over the conductor 20 to the switch-hook of the subscribers set.

When each of the relays 10 to 19 inclusive is deenergized, battery is supplied over the circuit just traced to the telephone set S, and when the receiver at that point is removed, current flows over this circuit through the primary of the induction coil 1, the transmitter T, to the common return is on the hook, a flows through the normal contact of the switchhook, the upper contact of the button K, the-polarized bell B, to the common return wire. The resistance of the circuit through the polarizedbell B, however, is so great that the current flow is extremely small and may be conbell B is connected in such a Way that the Moreover, the polarized 1 recourse ductor 20, through the relay contacts associated with the calling substation to the multiple wire at substation S, conductor 20, lower contact of switchboard H, upper contact of key K, polarized bell B, to the common return wire. In this manner the min rent flowing through the bell B is reversed and increased, and the bell rings. The con struction and operation of such polarized hells, and the manner of their use is so well known that no further description considered necessary.

It will be noted that the substation S is extended through the conductor 20 in multiplc to the .righthand contacts of the units relays 10 to 19inclusive, and thence to connection with one of the conductors in a the main cable, the conductor shown in this case being in the third tens group and the seventh conductor in that group. The designation of substation S would therefore be 26.

A called substation is shown-connected to the ninth. conductor in the zero group, the designation of such a telephone being 8. i

The establishment of a connection between telephone No. 526 and telephone No. 8 will now be described. substation S presses the button U and establishes thereby a connection from the common. conductor ground, the contact of button U winding of relay 18, to the conductor 21, and thence through the main cable to the free pole of the battery of higher potential, and thence to the common return. The relay 18 attracts its armatures and through the agency ofplate P locks them intheir actuated positions, where they remain when pressure is removed from the button U Since the designation of the called tele phone is 8, no tens relay need be energized,

ice

The subscriber at sincethe connection is now established from,

the substation S through the. conductor 20, the right-hand contact and armature of relay 18, the second from the left armature and normal contact of relay 3, the second are over the circuit traced to the substation S vwhere it travels through-the lower contact of the switchhook at that point, the polarized bell, to the common conductor. The polarized bell is actuated through the flow of current in this circuit.

.'units relay which may be in actuated position at that point. Talking current is supplied from the free pole of low potential battery, and the impedance coil similar to 9 which is connected in the circuit of the substation S At the conclusion of the conversation the subscriber at' substation S may simply replace his receiver on its hook or he may, if he so desires, press the button A and restore any tens or'units relay which is in the actuated position.

For the convenience of certain subscribers, buttons such as S" may be provided. These buttons are useful in calling, by the pressure of one button, a certain desired party. Suppose, for instance, that the subscriber atsubstation S were the superintendent of a factory, and that the party with whom he is in most direct contact is.a party whose telephone number is 17. He may then have ac buttcn provided to call this substa- .tion without going through the usual operation of pressing a tens and a units button.

;-It is apparent that the pressure of button S will energize the units relay 17, and the tens relay No. 1, so that a circuit will be established from the substation S, over the V conductor 20, through the contact and righthand armature of relay 17 the third from the left armature and normal contact of relay 3, the third from the left armature and normal contact of relay 2, the third from the left armature and alternate contact of relay 1, to the'eighth c nductor in the second group in the main a )le, such conductor leading to the substation 17. The operation of ringing the subscriber-is the same as described in the previous case.

""It should be noted that if such a system herein described is to be supplied with service from a central telephone exchange, the'tranks of such an exchange may be connected' to any. one of the multiple wires 'tion is made to this trunk, that talking curshown in the main cable, and when connecrent is supplied from the. trunk and not from the local impedance coil, since one of the relays 10 to 19 must be energized.

Since the means for receiving calls from the central exchange forms no part of the present invention, and circuits for such use are Well-known, they will not be described in the present instance.

It should be noted especially, that through the connections of the trunks leading from the units relays to the tens relays, and

through the armatures and contacts of the tens relays, the arrangement 1s such that these. trunks are connected, when no tens relay is energized, directly to the zero group of lines, so that theenergization of a units relay only is necessary when a one-digit number is to be called.

What is claimed is: 1. In a telephone system, telephone lines,

. relays for establishing connections between said lines,'said relays being energized only whilesaid connections are being established, and mechanical means common to said relays for locking said relays in their energized positions.

2. In a telephone system, telephone lines, relays for establishing connections between said lines, said relays being arranged to be energized only while said connections are being established, mechanical means common to said relays for locking said relays in their energized positions, and means for restoring said relays to their normal positions.

3. In a telephone system, telephone substations, relays for establishing connections between said substations, means located at said substations for operating said relays, and mechanical means common to said relays for holding said relays in their ener-.

said substations for operating said relays,

mechanical means common to said relays for holding said relays in their energized positions, and automatic means for restoring said relays to their normal positions. I

In a telephone system, telephone substations, relays for establishing connections between said substations, means located at said substations for operating said relays, mechanical means common to said relays for holding said relays in their energized positions, automatic means for restoring said relays to their normal positions, and means located at said substations for restoring said relaysto their normal positions.

6. In a telephone system, telephone lines arranged in groups, a group of connecting .circuits, a group of relays for extending said lines to said connecting circuits, a group of relays for extendmg sald connecting circuits to said lines, means for operating said relays, and means common to each said group of relays for mechanically holding said operated relays in their actuated positions.

7. In a telephone system, telephone lines arranged in groups, a group of connectin circuits, a set of relays for extending sai lines tosaid connecting circuits, a set of relays for extending said conpecting circuits to said lines, means for operating said relays, means common to each said set of relays for mechanically holding, said operatingrelays in their actuated positions, and automatic means for restoring said relays to their normal positions.

8. In a telephonesystem, a, plurality o? groups of telephone lines, a group of con necting circuits for interconnecting said telephone lines, a group of relays equal in number to said connecting circuits for eX- tending said lines to said connecting circuits a group of relays one less in number than said groups of lines for extending said connecting circuits to said lines, means for operating said relays, and mechanical means for holding said relays in their actuated positions 9. In a telephone system, a plurality of groups of telephone lines, a group of con necting circuits for interconnecting said telephone lines, a group of relays equal in number to said connecting circuits for tending said lines to said connecting circuits, a group of relays one less in number than said groups of lines for extending said connecting circuits to said lines, means for operating said relays, mechanical means for holding said relays in their actuated positions, and means for restoring said relays to their normal l msitions.

10. in a telephone systenn groups of telephone lines, a group of connecting circuits normally extended between said groups oi. lines. a set of relays equal in number to said connecting circuits for extending said lines to said connecting circuits, and a. set, of relays one less in number than said groups of lines for switching said connecting circuits from association with the group of lines to which they are normally extended into operation with others of said groups of lines.

ll. In a telephone system. groups of telephone lines a group of connecting circuits normally extended between said groups of lines. a set of relays equal in numbe to said connecting circuits for extending: said lines to said connecting circuits, a set of relays one less in number than said groups of lines for switching said connecting circuits from the group of lines to which they are normally extended to others of said groups of lines, means for o erating said rela s, and means for mechanically holding sa'i relays in their actuated positions. i

12. in a telephone system, groups of telephone lines a group of connecting circuits normally extended between said groups of lines, a set of relays equal in number to said connecting circuits for extending said lines to said connectim;- circuits, at set of relays one less in number than said groups of lines for switching said connecting circuits from the group of lines to which they are normally extended to others of said groups of lines, means for operating said relays, means for mei'vhanically liohv said relays to their normal positions.

13. In a telephone system telephone lines, relays for establishing connections between said lines, said relays beingenergized only while said connections are being established, mechanical means for locking" said relays in their energized positions, said mechanical means being responsive to the last relay to be actuated to lock only said last actuated relay.

14. in a telephone systenn; groups of telephone lines, a group of connecting circuits for intercminectiup; said telephone lines, a group of relays equal in number to said conuecliu; circuits for extending said lines to said connecting circuits, a, group of relays one less in number than said groups of telephone lines for extending said connecting circuits to said lines. means for operating said relays. each said group of relays for holding said relays in their actuated positions, said melin said relays in their 0 D v I actuated POsll'lOiiH, and means tor restoring mechanical means individual to llil chanical means being responsive to the last relays oi the group to be actuated to hold only said last actuated relay in. its actuated position. I

In witness whereot. I hereunto subscribe my name this 35th day of April, A. D. 191?".

HENRY P. GluillSEh.

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